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GHSA-W656-XFM5-JQJH

Vulnerability from github – Published: 2026-10-10 12:30 – Updated: 2026-10-10 15:30

Details

Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).

When deserializing a sketch in LIST mode, from either a byte buffer or a stream, the coupon count was read from the input and used as the number of entries to copy into a fixed buffer of 8 entries, without checking it against the buffer's capacity. A crafted sketch could cause a write of up to 988 bytes past the end of this internal heap buffer. This can corrupt heap memory, causing a crash and potentially enabling further exploitation.

This issue affects Apache DataSketches C++: from 1.0.0-incubating before 5.3.0. Only applications that deserialize HLL sketches from untrusted sources are affected.

Users are recommended to upgrade to version 5.3.0, which fixes this issue.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103501"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-122"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-10T11:17:34Z",
    "severity": null
  },
  "details": "Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp).\n\nWhen deserializing a sketch in LIST mode, from either a byte buffer or a stream, the coupon count was read from the input and used as the number of entries to copy into a fixed buffer of 8 entries, without checking it against the buffer\u0027s capacity. A crafted sketch could cause a write of up to 988 bytes past the end of this internal heap buffer. This can corrupt heap memory, causing a crash and potentially enabling further exploitation.\n\nThis issue affects Apache DataSketches C++: from 1.0.0-incubating before 5.3.0. Only applications that deserialize HLL sketches from untrusted sources are affected.\n\nUsers are recommended to upgrade to version 5.3.0, which fixes this issue.",
  "id": "GHSA-w656-xfm5-jqjh",
  "modified": "2026-10-10T15:30:21Z",
  "published": "2026-10-10T12:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103501"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/datasketches-cpp/releases/tag/5.3.0"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/n2oc2j841dzsv4239jjp08of66bo79c5"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/10/10/2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-103501 (GCVE-0-2026-103501)

Vulnerability from cvelistv5 – Published: 2026-10-10 10:22 – Updated: 2026-10-10 12:10

Title

Apache DataSketches: datasketches-cpp: HLL CouponList Deserialization Buffer Overflow allows memory corruption via a crafted sketch

Summary

Heap buffer overflow in the HLL sketch deserialization of Apache DataSketches C++ (repo: datasketches-cpp). When deserializing a sketch in LIST mode, from either a byte buffer or a stream, the coupon count was read from the input and used as the number of entries to copy into a fixed buffer of 8 entries, without checking it against the buffer's capacity. A crafted sketch could cause a write of up to 988 bytes past the end of this internal heap buffer. This can corrupt heap memory, causing a crash and potentially enabling further exploitation. This issue affects Apache DataSketches C++: from 1.0.0-incubating before 5.3.0. Only applications that deserialize HLL sketches from untrusted sources are affected. Users are recommended to upgrade to version 5.3.0, which fixes this issue.

Severity

No CVSS data available.

CWE

CWE-122 - Heap-based buffer overflow
CWE-1284 - Improper validation of specified quantity in input

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 939 records in the last 180 days details

References

3 references

URL	Tags
https://lists.apache.org/thread/n2oc2j841dzsv4239…	vendor-advisory
https://github.com/apache/datasketches-cpp/releas…	release-notes
http://www.openwall.com/lists/oss-security/2026/10/10/2

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache DataSketches	Affected: 1.0.0-incubating , ≤ 5.2.0 (semver)

Credits

Reported anonymously.

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-W656-XFM5-JQJH

CVE-2026-103501 (GCVE-0-2026-103501)

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